Patent US2656892A successfully refreshed from Google Patents.
US2656892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft sustaining rotor blade with suction system for boundary layer control
Assignee: Autogiro Company of America
•
Filing: 1948-10-19
•
Granted: 1953-10-27
•
Expires: 1968-10-19
Abstract
No abstract record available.
Inventors
- 👤 Harris S Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:40
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C21/00; B64C21/02; B64C21/025; B64C2230/00; B64C2230/04; B64C2230/28; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB404817A
Cited
FR807110A
Cited
GB497048A
Cited
GB504718A
Cited
US2406920A
Cited
US2408632A
Cited
US2463864A
Cited
US2464651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |